Method and device for separating sheet material

ABSTRACT

A method and apparatus for singling sheet material, in particular papers of value such as bank notes, checks, etc., for subsequent processing of single pieces of sheet material. To permit recognition of mix-ups in the singling order, maintenance of the singling order is checked at the place of singling by monitoring whether the next piece of sheet material to be singled is singled.

[0001] The present invention relates to a method and apparatus for singling sheet material, in particular papers of value such as bank notes, checks, etc., for subsequent processing of single pieces of sheet material.

[0002] Sheet material, e.g. bank notes, are usually processed using bank note processing machines wherein the bank notes are inserted into an input pocket in a stack. The input pocket is connected with a singler that singles the bank notes present in a stack and transfers them singly to a transport system. The transport system then transports the single bank notes e.g. past sensors for e.g. counting, recognizing and checking the state and authenticity of the bank notes. In dependence on the check results the single bank notes can finally be sorted into different output pockets.

[0003] Problems in processing can always arise when errors occur in the singling of the bank notes. A well-known error of this kind is the so-called double pick. Instead of a single bank note, two or more bank notes are grasped by the singler and transferred to the transport system. Errors of this kind can be recognized without any great problems by determining the thickness of the singled bank notes. If the determined thickness exceeds a predetermined threshold value, it is recognized that more than one bank note was singled. Greater problems result when the error involves a mix-up of the singling order. In this case the bank note to be singled next is not singled, but a bank note disposed after said note in the stack of bank notes inserted into the input pocket. A mix-up of singling order is problematic within a stack of bank notes in particular in the processing of different groups of bank notes separated from each other by separation or header cards. In this case a mix-up of singling order can lead to bank notes being erroneously attributed to the wrong group of bank notes.

[0004] The problem of the present invention is therefore to specify a method and apparatus for singling sheet material, in particular papers of value such as bank notes, checks, etc., for subsequent processing of single pieces of sheet material wherein mix-ups of the singling order can be recognized.

[0005] This problem is solved according to the invention by the features of claims 1 and 5.

[0006] The invention starts out from the consideration that singling order is always maintained when at the place of singling it is checked whether the piece of sheet material to be singled next is singled.

[0007] The advantage of the invention is to be seen in particular in that it permits problems to be avoided that result from a mix-up of singling order. Such mix-ups are problematic in particular in the processing of different groups of bank notes by means of separation cards since in this case the single groups of bank notes are accounted for incorrectly.

[0008] In a development it is provided that monitoring of the singling order is effected by checking a motion of the next piece of sheet material to be singled.

[0009] The advantage of the development is to be seen in particular in that monitoring the motion of the next piece of sheet material to be singled permits an especially simple realization of the monitoring of singling order.

[0010] Further advantages of the present invention can be found in the dependent claims and the following description of embodiments with reference to figures, in which:

[0011]FIG. 1 shows a schematic structure of an inventive apparatus for singling sheet material according to a first embodiment, and

[0012]FIG. 2 shows a schematic structure of an inventive apparatus for singling sheet material according to a second embodiment.

[0013] The figures show only the components essential in connection with the present invention. Similar components of the figures are marked by the same reference signs.

[0014]FIG. 1 shows a first embodiment of an apparatus for singling sheet material consisting of singler 10 to 13. Singler 10 to 13 works as a so-called friction wheel singler in the shown example and has singling wheels 10 and 11, retaining wheel 12 and input pocket 13 with a support for bank notes BN₁ to BN₃ to be singled. During singling by singler 10 to 13, bank notes BN₁ to be singled are grasped by singling wheels 10 and 11, singled and transferred to a transport system (not shown) of a bank note processing machine in which singler 10 to 13 is integrated. The transport system transports singled bank notes BN in stated direction T to permit further processing, such as testing, counting, sorting, etc. While one bank note BN₁ is being grasped and singled, other bank notes BN₂, BN₃ of the stack of bank notes inserted into input pocket 13 are retained by retaining wheel 12, so that only bank note BN₁ to be singled is singled.

[0015] In the case shown in FIG. 1, however, there is the danger of following bank note BN₂ being singled instead of bank note BN₁ to be singled next, and thus the predetermined singling order changed. This danger exists since bank notes BN lie on each other in the stack inserted into input pocket 13 in such a way that the leading edge of following bank note BN₂ is located before the leading edge of bank note BN₁ to be singled next. Thus there is a high probability in the shown case of following bank note BN₂ being grasped and singled by singling wheels 10, 11 instead of bank note BN₁ to be singled next.

[0016] Such a mix-up of singling order is problematic in particular in cases where different groups of bank notes are being processed. Such different groups of bank notes can be formed for example by deposits from different depositors. For separating the different deposits, so-called separation or header cards are placed between the various deposits or groups of bank notes before the latter are inserted into input pocket 13 as a stack. If such a separation card is present at the place of bank note BN₂ in the case shown in FIG. 1, a mix-up of singling order results in the assumption, after faulty singling of the separation card (bank note BN₂), that a new group of bank notes or a new deposit is beginning. Bank note BN₁ subsequently singled in mixed-up singling order is thus associated with the new group of bank notes or new deposit which is marked by the separation card (bank note BN₂). Bank note BN₁ is thus not attributed to the previous group of bank notes to which it belongs, but to the following group of bank notes, so that the accounting of the two groups of bank notes is incorrect.

[0017] Such accounting errors can be avoided if the mix-up of singling order is recognized, since this permits corresponding measures for correction to be taken. This is done using sensor 20 provided in input pocket 13 or the support of input pocket 13. Sensor 20 detects whether bank note BN₁ to be singled next is singled. For this purpose, the embodiment shown in FIG. 1 has mechanical sensor 20 which is formed by a roller with an incremental transducer. The signal of the incremental transducer is monitored as to whether pulses are generated at the time of an expected singling due to rotation of the roller caused by the singling of bank note BN₁ to be singled next. If the number of pulses corresponding to the path that bank note BN₁ is transported and resulting from the length of bank note BN₁ is additionally determined, a statement can be made with a high degree of certainty on whether next bank note BN₁ to be singled was singled. If no pulses in the signal of the incremental transducer are observed at the time of singling, however, bank note BN₁ to be singled next was not singled. In this case two events can have occurred. The first event can be a gap in singling, i.e. no bank note was grasped and singled by singling wheels 10, 11 at the predetermined singling time. In the second event, another bank note BN₂ was singled instead of bank note BN₁ to be singled next. The fact that singling took place can be detected for example by means of a light barrier in the transport system. Occurrence of the first event is uncritical. If the second event involving a mix-up of singling order is detected, however, suitable measures for error correction can be taken, e.g. singling stopped to eliminate the mix-up.

[0018]FIG. 2 shows a second embodiment of an apparatus for singling sheet material consisting of singler 10 to 13. Except for sensor 20, the second embodiment shown in FIG. 2 corresponds to the first embodiment shown in FIG. 1. The second embodiment according to FIG. 2 instead has sensor 30 that determines contactlessly whether bank note BN₁ to be singled next is grasped and singled by singling wheels 10, 11. Sensor 30 can be formed as an optical sensor for example. For detecting whether bank note BN₁ to be singled next is singled, optical sensor 30 can be designed for motion detection or optical sensor 30 is used to perform an image evaluation. As described for the first embodiment according to FIG. 1, the evaluation of optical sensor 30 is also effected during the time periods when singling is expected. It is likewise determined at likewise determined at the same time whether bank note BN₁ to be singled next is grasped and moved sufficiently far.

[0019] It is obvious that the described inventive apparatuses and methods can not only be used for the friction wheel singlers shown by way of example in the figures. Rather, the described principle is also suitable for singlers having a different structure, e.g. so-called suction air singlers which grasp bank notes to be singled by suction air or vacuum.

[0020] Likewise, it is obvious that singling can also be done from above, i.e. the upper-most bank note in the stack singled, instead of singling from below as shown in the figures, i.e. singling of the lowermost bank note in the stack.

[0021] Further, it is possible to mount sensor 20, 30 not in input pocket 13 or its support but at a different place in the area of singler 10 to 13 where the described monitoring of next bank note BN₁ to be singled is possible. 

1. A method for singling sheet material, for subsequent processing of single pieces of sheet material, wherein the sheet material to be singled (BN₁ to BN₃) is inserted into an input pocket (13) for singling, the inserted sheet material (BN₁ to BN₃) being singled in a singling order corresponding to an order of the inserted sheet material (BN₁ to BN₃), characterized in that the singling order is checked by checking in an area of the input pocket (13) at a time of singling whether a next piece of sheet material to be singled in the singling order (BN₁) is moved.
 2. A method according to claim 1, characterized in that it is checked how far the next piece of sheet material to be singled (BN₁) is moved at the time of singling.
 3. A method according to claim 1, characterized in that it is checked whether a piece of sheet material was singled at the time of singling.
 4. A method according to claim 1, characterized in that measures for error correction are taken if the piece of sheet material to be singled next (BN₁) was not singled.
 5. An apparatus for singling (10 to 13) of sheet material (BN), for subsequent processing of single pieces of sheet material (BN), having an input pocket (13) for sheet material to be singled (BN₁ to BN₃), the sheet material to be singled (BN₁ to BN₃) being singled in a singling order corresponding to an order of the sheet material to be singled (BN₁ to BN₃), characterized in that a sensor (20; 30) is provided in an area of the input pocket (13) for detecting at a time of singling whether a next piece of sheet material to be singled in the singling order (BN₁) is moved.
 6. An apparatus according to claim 5, characterized in that the sensor (20) has devices for mechanical detection.
 7. An apparatus according to claim 5, characterized in that the sensor (30) has devices for optical detection.
 8. An apparatus according to claim 5, characterized in that the apparatus for singling (10 to 13) is formed by a friction wheel singler.
 9. An apparatus according claim 5, characterized in that the apparatus for singling (10 to 13) is formed by a suction air singler.
 10. (CANCELED)
 11. (CANCELED) 